@inproceedings{8926, abstract = {{Piezoelectric transformers are well known since the publication of some patent applications at the end of the 1950s. But until today their only business use lies in the field of backlighting systems for LCDs. Due to key features as light-weight, flatness, high step-up at low volume and high efficiency piezoelectric transformers should be usable in a much broader range of applications. This contribution returns to mind their operating principle, shows how to model and to develop such devices as well as give some aspects for development trends that will lead to further applications.}}, author = {{Hemsel, Tobias and Littmann, Walter and Wallaschek, Jörg}}, booktitle = {{Ultrasonics Symposium, 2002. Proceedings. 2002 IEEE}}, issn = {{1051-0117}}, keywords = {{piezoelectric devices, reviews, transformers, backlighting systems, flatness, high efficiency piezoelectric transformers, high step-up, light-weight, low volume, operating principle, piezoelectric transformers, Circuits, Costs, Electromagnetic devices, Electromagnetic fields, Mechanical energy, Piezoelectric materials, Power electronics, Switching frequency, Transformers, Vibrations}}, number = {{vol.1}}, pages = {{645--648}}, title = {{{Piezoelectric transformers - state of the art and development trends}}}, doi = {{10.1109/ULTSYM.2002.1193485}}, volume = {{1}}, year = {{2002}}, } @inproceedings{8915, abstract = {{Ultrasonic linear motors have now been investigated for several years. Their key features are high thrust forces related to their volume and good position-accuracy. This contribution consists of two main parts. In the first part we describe the state-of-the-art of linear piezoelectric motors. Characteristics like no-load velocity, maximum thrust force and other technical properties of commercially available devices will be reported as well as those of prototypes. In the second part we report an ongoing research and development project aiming at a linear piezoelectric motor, which is capable of surpassing some of the shortcomings of other piezoelectric motors}}, author = {{Hemsel, Tobias and Wallaschek, Jörg}}, booktitle = {{Ultrasonics Symposium, 2000 IEEE}}, issn = {{1051-0117}}, keywords = {{linear motors, ultrasonic motors, linear piezoelectric motor, maximum thrust force, no-load velocity, ultrasonic linear motor, Electromagnetic devices, Electromagnetic fields, Frequency, Friction, Gears, Materials science and technology, Piezoelectric materials, Research and development, Vibrations, Wheels}}, pages = {{663--666 vol.1}}, title = {{{State of the art and development trends of ultrasonic linear motors}}}, doi = {{10.1109/ULTSYM.2000.922635}}, volume = {{1}}, year = {{2000}}, }